Pedkb mikkelseh



P. MIKKELSEN.

DQOH CLOSER. APPLICATION FILED nza. 3. ma.

Patented Sept. 2, 1919.

I Ik I N' I iN IH e "rml cLIwInIA vLANounAPIl co.. wAsHmaoN. n. c.

PATENT Ormea FEDER iunnn'nsnn, orsrainreen, coNNncrIcUT/Asseuon 're THE YALE arowivn MANUFACTURING coMrANY, or srnivrronn, CONNECTICUT. i

Doon-CLOSER. i

Specification ofttersetent Y `ratented sept. e, 1919.

Application fusa February 3, 1919. f seriai 110.274,76. i y u To all eli/wm it may concern.'

Be it known that I, FEDER MIKKELSEN, a citizen of the United States, and a resident of Stamford, in the county of `Fairfield and State of Connecticut, have invented certain new and useful improvements in "Doon Closers; and l". do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled inthe art to whichit appertains to malte and usethe same. i

This invention relates to improvements in that type of door closer having means by which therdoor may be held in openuposition, the object being to provide means for releasing the door holding means in the event of a fire so that the door will then be.

automatically closed bythe closer, and it consists in the; parts, and arrangement of partsl as will be hereinafter described and pointed out in the', claims.

In the accompanying drawings; Figure 1 is a view in bottom plan of a door closer lever arm having my improvement applied to the same; Fig. 2 is a view in section of the lever arm with my improvement thereon; Fig. 3 is a similar view showingvthe spring released and Fig. t is a perspective view of the bolt retaining member.

This improvement is designed for use with door closers or with combined checks and closers, hence I would have it understood that I do not limit its use to either, and that the term door closer7 used in the specification is bined checks and closers.

5 represents the casing of a doorcloser and (S the spindle of the same to which the lever arm 7 is secured, the said lever arm being adapted for coperation with the door closer in the usual and well known manner.

For the purpose of `holding the door open, the lever arm `7 is pro-vided with a spring pressed dog 8, and the cap of the closer casing with an upwardly projecting rib or stop 9 which is engaged by the lower beveled end of the dog when the dooris in' its open position, the dog riding overthe rib 9 during the opening movement of the door and drop pingbehind the rib when the doorisjtully open, the pressure of the spring against the intended to include also fcom- 7 the l retaining" `ment."Lock plate 1G is comparatively long `movement in an opening through the lever arm 7, `and is provided with a chisel or beveled lower end to engage the rib or stop 9 and with a head which limits its downward movement,1` and against which the free end o1 the long flat spring 10 bears, the head of the dog being preferably grooved to receive'the end of the spring 10 whereby the dog will be prevented from turningin its bearing. i 1 i :The spring 10 is secured at its other end, by a rivet or screw 11 to the leverarm 7, with its free end in position overthe dog as previously explained. Passing upwardly from the underside of arm 7, andl through the 'latter andalso lthrough the spring 10 is the tension bolt `1Q. This bolt 12 has 'free movement inthe lever arm: 7,*and while it may beprovided at `its threaded end with a nut to bear on the springlO, I'preter to thread the bolt opening in the spring 10 so that the bolt will directly engage `the spring as shown in Figs. 2 and Bof the drawing.

`13 is a retaining plate one end of which rests against the depending shoulder 1l on the armi?, `while its outerend` is slotted'to embrace the adjacent end member or? legof the yoke 18, which latter is permanently secured to the underside of the arm 7. This retaining plate 13 is provided with an opening for the screw bolt 12,` and when the latter is in place, and the parts in normal position, the head' of the bolt bears against the underside of the said plate 13 and is held in place by thelatten so that when thefspring 10 is put under tension by screwing upon the bolt, the screw willbe supported and held in place by the plate 18. The end of retaining plate 318 carried by theyoke 18 is held downinfits normal positionbytheV bent end 515 u01E the lockplate 16. Thebent end 1of lock plate 16 `is bifurcated to receive the narrowed `endy17 of the yoke 18 and also the leg or end member of the yoke at said narrowed end, and the lip 15 of the lock plateisadaptedto take over the'adjacent end of theretaining plate 13 asishown in Fig. 2, and positively lock the engaged end platelagainst any moveand light in weight, as is also the horizontal 1 member of the yoke 18, so that the said parts will be quickly heated when exposed tohi gh temperature, and lock plate 16 is secured against the under face of the yoke 18 by a fusible alloyor solder that will melt at a comparatively low temperature.Y

When the parts are assembled as shown in Figs. l 'and 2, the spring 10 is under. tension and is yieldingly holding the dog 8 in its yposition to yengage the stop 9, the screw the retaining plate 13 is released, as above described, the tension of thefspring is also released and the freeV end of thelatter'rises above-the dog thus leaving thelatter free to rise and ride over the stop 9 without; any opposition, or with such slight opposition that may be readily' overcome by the door closer spring.

VIn assembling or reassembling the parts, the retaining plate 13 mountedY on the screw I bolt l2, should besecuredwith its ends ab-utting respectively against the shoulder 14 on thef leverarm:y 7, andthe lip 15r of the lock yoke.

plate 16,;theV latterv being solderedi to the The spring is then brought down into contact with the'head of the: dog, and the proper tension applied thereto by turning the screw bolt.v

With this improvement the fusible members or rather the metal parts held together by the fusiblesolder or alloy are comparatively thin and light. and are separated from the heavier lever arm so.V that they will be instantly affectedby anyI material, rise in temperature which if it be above normal will meltthej solder and thus release the spring as previously explained. 'i

In theA ordinary use ofV the door, power sufiicient can'be applied to the latter tozcause the dog to ride over the stopboth" inclosing and opening. If however the door'is to be left open the dog` will engage'the stop 9 and be held down by the spring 10, against. the closingtendencyV of the spring in the closer.

It ig evident that many slight changes might be resorted to inthe relative arrangement of parts shown and described without departing from the spirit and scope of my invention. Hence I wouldhave it understood that I do not wish to confine myself to theexact construction and arrangement of parts shown andI described but,

copia-'omnia patent may ne obtinea. far' Having fully described my invention what I claim as new and desire to secure by Letters-Patent, is

1. The combination of a door closer having a stop, a lever arm carrying a dog, a spring for yieldingly holding the dog against the stop, a bolt retaining means carried by the lever arm and secured in ixed position to the latter by fusible solder, and a tension bolt passing through the said retaining means and the spring and connected with the latter, whereby the said bolt and spring will be released when the retaining means is released by the melting of the solder.

2. The combination of a door closer having a. stop, a lever arm carrying a dog, a spring fixed at one end and bearing against the dog' at its other end for yieldingly. holding the dog against the stop, a bolt retaining member secured to the lever arm in fixed relation thereto by fusible solder, and a tension bolt passing through the retaining member, lever arm and spring 'and connected with the latter for normally holding the spring under tension.

Y 3. The combination of a door closer having a stop, a lever arm carrying a dog, a spring for yieldingly holding the dog against the stop, a tension adjusting bolt for the spring, the said bolt passing loosely through the lever arm, and a retaining plate A l forming a support for the tension adjusting bolt, the said plate having a fixedsupport at oneend and a movable support at the other end, the said movable support being secured in place by fusible material.

L1Thecombination of a door closer having a stop, a lever arm carrying a dog, a spring for yieldingly holding the dog againstV the stop, a tension adjusting bolt for the spring, the said bolt passing loosely through the lever arm, a yoke secured to the leverarm, a retaining plate forming the support for the bolt, the said retaining plate bearing at one end against a shoulder on the lever arm and a lock plate secured by fusible alloyv to the yoke and provided with a lip forming a support for the other end of the bolt retaining plate.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

FEDER MIKKELSEN.

lVitnesses:

P. C. RICHTER, CHAs. A. BERRY.

ve-.cents each, by addressing the Commissioner of Yatents. Washington, D. C. 

